Photoshop plugins aren't DLL are they? I thought they were: 8bf or 8be or 8li etc.
IIRC, they are DLL's renamed to .8bf
(Just like a windows screen saver is an .EXE renamed to .SCR, with a few extra requirement such as some command line parameters is needs to support)
If you view the binary code of a photoshop plugin you'll see that they all start with 'MZ', just like any other EXE or DLL file. Now, if it were possible to create a photoshop filter through Bmax, I'd definitely be interested in finding out how. :-?